Air purifier



FIG. 1 is a front perspective view of an air purifier showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a plan view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a section view thereof taken along line 9—9 in FIG. 3, wherein an internal structure is omitted; and,

FIG. 10 is a front perspective view thereof, wherein a louver is open. 

The ornamental design for an air purifier, as shown and described. 